Research of Rotor Positioning on Solving the Pole Pairs Mismatch between PMSM and Rotating Transformer
Zhang Chunjuan, Wang Huizhen, Liu Weifeng, Zirui Fu, Wang Yongjie, Zhou Yang · 2020
Because of the mismatch between poles of permanent magnet synchronous motor (PMSM) and rotating transformer, the PMSM is difficult to start smoothly. Under this condition, the motor's zero position is not unique and the detection is not accurate. A method of measuring rotor position is proposed to solve this problem. Taking the three-phase six-state control as example, a series of sets of angle data are premeasured in sequence at different position and different rotating speed. Before the motor start, the rotor is fixed to a given position, which is included in the pre-measured data. Then the accurate angle of the rotor is defined. By the proposed method, the motor can start smoothly, as well as the accuracy and the fluctuation of angle data obtained will be improved. Therefore the stability of the system can be enhanced which will meet the high requirement of PMSM system because of the simplified control system. The correctness of the analysis is verified by the experiment.